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authorNicholas Mc Guire <der.herr@hofr.at>2015-01-17 05:05:34 +0100
committerIngo Molnar <mingo@kernel.org>2015-02-04 07:57:36 +0100
commitde30ec47302c101c7badc8fe687641fd75e596e7 (patch)
tree15bf011b77ed7850f5b46c85f9940737252ef9fc /kernel/sched/completion.c
parent51587bcf31d070119d37de6103543c807f5ccdb3 (diff)
downloadlinux-de30ec47302c101c7badc8fe687641fd75e596e7.tar.bz2
sched/completion: Remove unnecessary ->wait.lock serialization when reading completion state
Signed-off-by: Nicholas Mc Guire <der.herr@hofr.at> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1421467534-22834-1-git-send-email-der.herr@hofr.at Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/completion.c')
-rw-r--r--kernel/sched/completion.c9
1 files changed, 1 insertions, 8 deletions
diff --git a/kernel/sched/completion.c b/kernel/sched/completion.c
index 607f852b4d04..9d1fe32da232 100644
--- a/kernel/sched/completion.c
+++ b/kernel/sched/completion.c
@@ -288,13 +288,6 @@ EXPORT_SYMBOL(try_wait_for_completion);
*/
bool completion_done(struct completion *x)
{
- unsigned long flags;
- int ret = 1;
-
- spin_lock_irqsave(&x->wait.lock, flags);
- if (!x->done)
- ret = 0;
- spin_unlock_irqrestore(&x->wait.lock, flags);
- return ret;
+ return !!ACCESS_ONCE(x->done);
}
EXPORT_SYMBOL(completion_done);